<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title></title>
    <style media="screen">
    body {background:pink}
    </style>
  </head>
  <body>
    <svg width="800" height="600">
      <rect x="100" y="100" width="400" height="300" style="stroke:red;stroke-width:20;fill:rgba(0,0,0,0)" onclick="alert('a')"></rect>
    </svg>
  </body>
</html>
